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Type: Journal article
Title: Systematic evaluation of one-dimensional unsteady friction models in simple pipelines
Author: Vitkovsky, J.
Bergant, A.
Simpson, A.
Lambert, M.
Citation: Journal of Hydraulic Engineering, 2006; 132(7):696-708
Publisher: ASCE-Amer Soc Civil Engineers
Issue Date: 2006
ISSN: 0733-9429
Statement of
John P. Vítkovský, Anton Bergant, Angus R. Simpson and Martin F. Lambert
Abstract: In this paper, basic unsteady flow types and transient event types are categorized, and then unsteady friction models are tested for each type of transient event. One important feature of any unsteady friction model is its ability to correctly model frictional dissipation in unsteady flow conditions under a wide a range of possible transient event types. This is of importance to the simulation of transients in pipe networks or pipelines with various devices in which a complex series of unsteady flow types are common. Two common one-dimensional unsteady friction models are considered, namely, the constant coefficient instantaneous acceleration-based model and the convolution-based model. The modified instantaneous acceleration-based model, although an improvement, is shown to fail for certain transient event types. Additionally, numerical errors arising from the approximate implementation of the instantaneous acceleration-based model are determined, suggesting some previous good fits with experimental data are due to numerical error rather than the unsteady friction model. The convolution-based model is successful for all transient event types. Both approaches are tested against experimental data from a laboratory pipeline.
Rights: © 2006 ASCE
DOI: 10.1061/(ASCE)0733-9429(2006)132:7(696)
Appears in Collections:Aurora harvest 7
Civil and Environmental Engineering publications
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